The Black Wings organization may be considered dark by society, as their business revolves around espionage and assassination, but within the organization, things are different. No one knows who the leader is, yet there isn't a single member who doesn't admire him, as the system by which it operates is impressive.
First and foremost, all the jobs they perform are well-paid. Being an assassin is not an easy job; you're always in someone's crosshairs, and killing someone is always a dangerous mission, but as they say, "Everything has a price," and the Black Wings make sure that the price is right.
Second, they have connections and power, because otherwise, they wouldn't remain untouched after the jobs they've completed. This allows their members to work without worrying about the consequences.
This also means they don't accept jobs that could compromise them. The acceptance of missions undergoes a thorough level of scrutiny, ensuring the safety of their members.
